How much would someone who has a mass 54.1 kg on Earth weigh if they were to stand on the surface of Mars? (Take RMars= 3393 km and MMars=6.45x10^23 kg. I've been using the formula F=GmM/R^2 with the 3393km converted to meters. (6.67 x 10^-11 Nm^2/kg^2) (54.1 kg) (6.45 x 10^23kg) / (3393000 km)^2 This gives me 202.17 N. Isn't this the gravitational force? So if I multiplied this by the 54.1kg, wouldn't this give me the weight? I ended up with 10937.36 kg, but this doesn't seem right.